There are a lot of posts about "Master probe"...
Some of us have a real "master probe", which is used only to do a "zero" (like AndersI said) with resetting to theo the offsets and repositioning the sphere (answer "yes")
Another way to consider the "Master probe" is only to say "yes, the sphere had moved", then all the offsets are calculating from this tip. In this case, recalibrating this tip and answering "no" will only give an offset to this tip from its previous calibration.
Re-calibrate after a homing takes the same way. If the zero on the scale is not repeatable, you can say that the sphere physically moved compared to the scale. If you re-calibrate only the tip answering "No", you just add to the offsets the "zero defects", so the measured part should be measured in a reference close to the reference before homing (because the zero offset has the same effect on the part and on the sphere). So it has no effect on others calibrated tips...
About both points, it's only my opinion... But I constructed it with a lot of tests on ring gages, gauge blocks and different parts...
